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authorMiklos Szeredi <mszeredi@suse.cz>2008-07-25 01:48:58 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-25 10:53:48 -0700
commit764c76b371722e0cba5c24d91225f0f954b69d44 (patch)
tree3f9bd533878f502b1235194b50a101a84a7c68be /fs/locks.c
parentb648a6de00770cc325c22f43bdd4e935f6a2ee55 (diff)
downloadlinux-stericsson-764c76b371722e0cba5c24d91225f0f954b69d44.tar.gz
locks: allow ->lock() to return FILE_LOCK_DEFERRED
Allow filesystem's ->lock() method to call posix_lock_file() instead of posix_lock_file_wait(), and return FILE_LOCK_DEFERRED. This makes it possible to implement a such a ->lock() function, that works with the lock manager, which needs the call to be asynchronous. Now the vfs_lock_file() helper can be used, so this is a cleanup as well. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Cc: "J. Bruce Fields" <bfields@fieldses.org> Cc: Trond Myklebust <trond.myklebust@fys.uio.no> Cc: Matthew Wilcox <matthew@wil.cx> Cc: David Teigland <teigland@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/locks.c')
-rw-r--r--fs/locks.c23
1 files changed, 9 insertions, 14 deletions
diff --git a/fs/locks.c b/fs/locks.c
index 6222e4b580e2..01490300f7cb 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -1747,21 +1747,16 @@ static int do_lock_file_wait(struct file *filp, unsigned int cmd,
if (error)
return error;
- if (filp->f_op && filp->f_op->lock != NULL)
- error = filp->f_op->lock(filp, cmd, fl);
- else {
- for (;;) {
- error = posix_lock_file(filp, fl, NULL);
- if (error != FILE_LOCK_DEFERRED)
- break;
- error = wait_event_interruptible(fl->fl_wait,
- !fl->fl_next);
- if (!error)
- continue;
-
- locks_delete_block(fl);
+ for (;;) {
+ error = vfs_lock_file(filp, cmd, fl, NULL);
+ if (error != FILE_LOCK_DEFERRED)
break;
- }
+ error = wait_event_interruptible(fl->fl_wait, !fl->fl_next);
+ if (!error)
+ continue;
+
+ locks_delete_block(fl);
+ break;
}
return error;